Sound card and vacuum pump: what they have in common

1. Step 1. Sound card — has part — Analog-to-digital converter. ADC/DAC.
2. Step 2. Analog-to-digital converter — is part of — Oscilloscope. Digital oscilloscopes.
3. Step 3. Oscilloscope — has part — Cathode-ray tube. The first ones used CRTs.
4. Step 4. Cathode-ray tube — evolved into — Electron. Thomson discovered the electron in cathode rays.
5. Step 5. Electron — is used in — Electron microscope. A beam of electrons instead of light.
6. Step 6. Electron microscope — has part — Vacuum pump. A vacuum in the column.

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